Programmatic manipulation of morphsA morph can be made a submorph of some other morph using the addMorph: operation. This operation updates both the owner slot of the submorph and the submorphs list of the owner to reflect the desired configuration. For example, adding morph B to morph A adds B to A submorph list, removes B from its old owner (if any), and sets B's owner to A. The addMorph: operation also updates the layout of both B's old and new owners. The global position of a morph is held invariant by addMorph: (although some morphs may perform an automatic layout as a side-effect of addMorph:, immediately changing the position of the newly- added morph.).
Here are some other useful messages to morphs:
owner "a morph's owner" morphs "a copy of the morphs submorph list" morphCount "the number of submorphs" morphsDo: aBlock "iterate over the direct submorphs" allMorphsDo: aBlock "iterate over the morph and all its submorphs" delete "remove the morph from its owner" removeMorph: m "remove the submorph m" isInWorld "is the morph in a world?" world "the morph's world (must be in a world)" copy "copy the morph and its submorphs" copyRemoveAllMorphs "copy the morph without its submorphs"